Choose your country or region


South Africa

EN

Canada

FR EN

México

ES EN

United States

EN

Australia

EN

China / 中国

ZH EN

India

EN

South Korea / 대한민국

KO EN

Malaysia

EN

Singapore

EN

Taiwan, China / 中国台湾

ZH EN

Thailand

TH EN

Vietnam

VI EN

Česká Republika

CS EN

Denmark

DA EN

Deutschland

DE EN

España

ES EN

France

FR EN

Ireland

EN

Österreich

DE EN

Polska

PL EN

Schweiz / Suisse / Svizzera

DE FR IT EN

Sweden

SV EN

Netherlands

NL EN

Norway

EN

Global

EN

Please start typing to get suggestions.

Website results

Suggestions are being loaded.


Product suggestions

Suggestions are being loaded.


Estimation of screw diameters

Download

Estimation of screw diameters

according to VDI guideline 22301)

The following procedure allows a rough estimate to be made of the required screw dimensions for a particular screwed connection and temperature around 20 °C, in correspondence with the details in VDI 2230. The result should be checked mathematically in each case.

1) VDI = Verein Deutscher Ingenieure
Procedure

A Select in column 1 the next higher force to the work force FA,Q acting on the bolted joint.

B The required minimum preload FM min is found by proceeding from this number:

Estimation of screw diameters

C The required maximum preload force FM max is found by proceeding from this force FM min by:

Estimation of screw diameters

D Once the preload (force) has been estimated, the correct screw size is found next to it in column 2 to 4 underneath the appropriate strength class.

Example

A joint is loaded dynamically and eccentrically by the axial force FA = 8500 N. The screw of strength class 12.9 will be assembled with a manual torque wrench.
A 10 000 N is the next higher force to FA in column 1
B 2 steps for «eccentric and dynamic axial force» lead to FM min = 25 000 N
C 1 step for «tightening with manual torque wrench» leads to FM max = 40 000 N
D For FM max = 40 000 N thread size M10 is found in column 2 (property class 12.9)

Estimation of screw diameters